Does anyone remember those ...I don't know what to call them, they attached to your legs, and had curved metal bands that you stood on, about a meter off the ground, and the bands were springy. Wearing a pair of these things you could run at some crazy speed, bounding down the street.
I can't think of any search terms that aren't too generic.
Powerbocking. I worked with a guy in 2010 who had them. He could run as fast as his daughter could bike. Said falling over was pretty dangerous at speed.
I can't think of any search terms that aren't too generic.